There's just something about the way that word sounds that is so appealing. My ten year old introduced me to oobleck. It's a substance (made from cornstarch and water) that has the properties of both a liquid and a solid.
The other word I love is ogg vorbis. Okay--that's two words, but it's one thing--a compressed music format, akin to mp3, but an open source format. I think it would make a good swear--by the ogg vorbis! Go ogg yourself! Vorbis!
Ever since my boys discovered what a palindrome was, they like to bring palandromes to our dinner time conversation. Their current favorite:
Yo Banana Boy.
Yes, it's a palindrome.
What are your favorite words and why?